<template>
<div>
  <div class="shopCart">
    <div class="content" @click="toggleList">
      <div class="content-left">
        <div class="logo-wrapper">
          <div class="logo" :class="{'highlight': totalCount>0}">
            <span
              class="font_family icon-shopping_cart"
              :class="{'highlight': totalCount>0}"
            >
            </span>
          </div>
          <div v-show="totalCount>0" class="num">{{totalCount}}</div>
        </div>
        <div
          class="price"
          :class="{'highlight': totalCount>0}"
        >
          ￥{{totalPrice}}
        </div>
        <div class="desc">另需配送费￥{{deliveryPrice}}元</div>
      </div>
      <div class="content-right" @click.stop.prevent="pay">
        <div class="pay" :class="payClass">
          {{payDesc}}
        </div>
      </div>
    </div>
    <div class="ball-container">
      <transition-group
        name="drop"
        tag="div"
        v-on:before-enter="beforeEnter"
        v-on:enter="enter"
        v-on:after-enter="afterEnter"
      >
        <div
          v-for="(ball, index) in balls"
          v-show="ball.show"
          :key="index"
          class="ball"
        >
          <div class="inner inner-hook">
          </div>
        </div>
      </transition-group>
    </div>
    <transition name="fold">
      <div class="shopcart-list" v-show="listShow">
        <div class="list-header">
          <h2 class="title">购物车</h2>
          <span class="empty" @click="empty">清空</span>
        </div>
        <div class="list-content" ref="listContent">
          <ul>
            <li
              class="food"
              v-for="(food, index) in selectFoods"
              :key="index"
            >
              <span class="name">{{food.name}}</span>
              <div class="price">
                <span>￥{{food.price*food.count}}</span>
              </div>
              <div class="cartcontrol-wrapper">
                <cart-control :food="food"></cart-control>
              </div>
            </li>
          </ul>
        </div>
      </div>
    </transition>
  </div>
  <fade-animation>
    <div class="list-mask" v-show="listShow" @click.stop.prevent="hideList">
    </div>
  </fade-animation>
</div>
</template>

<script>
import Bscroll from 'better-scroll'
import FadeAnimation from 'components/fade/Fade'
import cartControl from 'components/cartcontrol/cartcontrol'
export default {
  name: 'shopCart',
  data () {
    return {
      balls: [
        {show: false},
        {show: false},
        {show: false},
        {show: false},
        {show: false}
      ],
      dropBalls: [],
      fold: true
    }
  },
  props: {
    deliveryPrice: Number,
    minPrice: Number,
    selectFoods: {
      type: Array,
      default () {
        return [{
          price: 10,
          count: 1
        }]
      }
    }
  },
  computed: {
    totalPrice () {
      let total = 0
      this.selectFoods.forEach((food) => {
        total += food.price * food.count
      })
      return total
    },
    totalCount () {
      let count = 0
      this.selectFoods.forEach((food) => {
        count += food.count
      })
      return count
    },
    payDesc () {
      if (this.totalPrice === 0) {
        return `￥${this.minPrice}元起送`
      } else if (this.totalPrice < this.minPrice) {
        let diff = this.minPrice - this.totalPrice
        return `还差￥${diff}元起送`
      } else {
        return '去结算'
      }
    },
    payClass () {
      if (this.totalPrice < this.minPrice) {
        return 'not-enough'
      } else {
        return 'enough'
      }
    },
    listShow () {
      if (!this.totalCount) {
        return false
      }
      let show = !this.fold
      if (show) {
        this.$nextTick(() => {
          if (!this.scroll) {
            this._initScroll()
          } else {
            this.scroll.refresh()
          }
        })
      }
      return show
    }
  },
  methods: {
    pay () {
      if (this.totalPrice < this.minPrice) {
        return
      }
      alert(`支付￥${this.totalPrice}元`)
    },
    hideList () {
      this.fold = true
    },
    empty () {
      this.selectFoods.forEach((food) => {
        food.count = 0
      })
    },
    _initScroll () {
      this.scroll = new Bscroll(this.$refs.listContent, {
        click: true
      })
    },
    toggleList () {
      if (!this.totalCount) {
        return
      }
      this.fold = !this.fold
    },
    drop (el) {
      for (let i = 0; i < this.balls.length; i++) {
        let ball = this.balls[i]
        if (!ball.show) {
          ball.show = true
          ball.el = el
          this.dropBalls.push(ball)
          return
        }
      }
    },
    beforeEnter (el) {
      let count = this.balls.length
      while (count--) {
        let ball = this.balls[count]
        if (ball.show) {
          let rect = ball.el.getBoundingClientRect()
          let x = rect.left - 32
          let y = -(window.innerHeight - rect.top - 22)
          el.style.display = ''
          el.style.webkitTransform = `translate3d(0,${y}px,0)`
          el.style.transform = `translate3d(0,${y}px,0)`
          let inner = el.querySelector('.inner-hook')
          inner.style.webkitTransform = `translate3d(${x}px,0,0)`
          inner.style.transform = `translate3d(${x}px,0,0)`
        }
      }
    },
    enter (el) {
      /* eslint-disable no-unused-vars */
      let rf = el.offsetHeight // 触发浏览器重绘，offsetWidth、offsetTop等方法都可以触发
      this.$nextTick(() => {
        el.style.webkitTransform = 'translate3d(0,0,0)'
        el.style.transform = 'translate3d(0,0,0)'
        let inner = el.querySelector('.inner-hook')
        inner.style.webkitTransform = 'translate3d(0,0,0)'
        inner.style.transform = 'translate3d(0,0,0)'
      })
    },
    afterEnter (el) {
      let ball = this.dropBalls.shift()
      if (ball) {
        ball.show = false
        el.style.display = 'none'
      }
    }
  },
  components: {
    cartControl,
    FadeAnimation
  }
}
</script>

<style scoped lang="stylus">
  @import "../../common/stylus/mixin.styl"
  .shopCart
    height: 48px
    width: 100%
    position: fixed
    z-index: 50
    left: 0
    bottom: 0
    .content
      display: flex
      background: #141d27
      .content-left
        flex: 1
        font-size: 0
        .logo-wrapper
          display: inline-block
          position: relative
          top: -10px
          margin: 0 12px
          padding: 6px
          width: 56px
          height: 56px
          box-sizing: border-box
          vertical-align: top
          border-radius: 50%
          background: #141d27
          .num
            position: absolute
            top: 0
            right: 0
            width: 24px
            height: 16px
            line-height: 16px
            text-align: center
            border-radius: 16px
            font-size: 9px
            font-weight: 700
            color: #fff
            background: rgb(240,20,20)
            box-shadow: 0 4px 8px 0 rgba(0,0,0,.4)
          .logo
            width: 100%
            height: 100%
            border-radius: 50%
            background: #2b343c
            text-align: center
            &.highlight
              background: rgb(0,160,220)
            .icon-shopping_cart
              font-size: 24px
              color: #80858a
              line-height: 44px
              &.highlight
                color: #fff
        .price
          display: inline-block
          vertical-align: top
          line-height: 24px
          margin-top: 12px
          box-sizing: border-box
          padding-right: 12px
          border-right: 1px solid rgba(255,255,255,.1)
          font-size: 16px
          font-weight: 700
          color: rgba(255,255,255,.4)
          &.highlight
            color: #fff
        .desc
          display: inline-block
          vertical-align: top
          line-height: 24px
          margin-top: 12px
          margin-left: 12px
          font-size: 10px
          color: rgba(255,255,255,.4)
      .content-right
        flex: 0 0 105px
        width: 105px
        .pay
          height: 48px
          line-height: 48px
          text-align: center
          font-size: 12px
          color: rgba(255,255,255,.4)
          font-weight: 700
          background: #2b333b
          &.not-enough
            background: #2b333b
          &.enough
            background: #00b43c
            color: #fff
    .ball-container
      .ball
        position fixed
        left 32px
        bottom 22px
        z-index 200
        &.drop-enter,&.drop-enter-active
          transition all 0.4s cubic-bezier(0.49,-0.29,0.75,0.41)
          .inner
            width 16px
            height 16px
            border-radius 50%
            background rgb(0,160,220)
            transition all 0.4s linear
    .shopcart-list
      position: absolute
      top: 0
      left: 0
      z-index: -1
      width: 100%
      transform translate3d(0,-100%,0)
      &.fold-enter-active, &.fold-leave-active
        transition: all .5s
      &.fold-enter, &.fold-leave-to
        transform translate3d(0,0,0)
      .list-header
        height: 40px
        line-height: 40px
        padding: 0 18px
        background: #f3f5f7
        border-bottom: 1px solid rgba(7,18,27,.1)
        .title
          float: left
          font-size: 14px
          color: rgb(7,17,27)
        .empty
          float: right
          font-size: 12px
          color: rgb(0,160,220)
      .list-content
        padding: 0 18px
        max-height: 217px
        background: #fff
        overflow: hidden
        .food
          position: relative
          padding: 12px 0
          box-sizing: border-box
          border-1px(rgba(7,17,27,.1))
          .name
            line-height: 24px
            font-size: 14px
            color: rgb(7,17,27)
          .price
            position: absolute
            right: 90px
            bottom: 12px
            line-height: 24px
            font-size: 14px
            font-weight: 700
            color: #f01414
          .cartcontrol-wrapper
            position: absolute
            right: 0
            bottom: 6px
  .list-mask
    backdrop-filter: blur(10px)
    position: fixed
    top: 0
    left: 0
    width: 100%
    height: 100%
    z-index: 40
    background: rgba(7,17,27,0.6)
</style>
